Opposed roll crusher with complementary double-curvature dress



J. L. LATTURE Jan. 27, 1948.

OPPOSED ROLL CRUSHER WITH COMPLEMENTARY DOUBLE-CURVATIJRE DRESS Filed Oct. 9; 1944 FIG. I.

INVENToR. JAMES L.I ATTURE BY ym/Wuxi ATTORN Patented Jan. 27, 1948 OPPOSED ROIIL CRUSHER WITH COMPLE- MEN TARY DOUBLE-CURVATURE DRESS James L. Latture, Los Angeles, Calif., assignor to Gruendler Crusher & Pulverizer Company, St. Louis, Mo., a corporation of Missouri Application October 9, 1944, Serial No. 557,740

4 claims. (ci. al1-236) This invention relates in general to certain new and useful improvements'in rock crushers, and more particularly to a roll type rock crusher which is capable of grinding rock to'relatively small particles without the productionof long or prismatically shaped fragments.

In crushing rock for various purposes, and particularly for use in road surfacing operations, various types of roll crushers have been utilized because of the high speed volume and capacity which roll crushers ordinarily have, as compared with other types of crushing equipment. The difficulty with such crushers, however, has been the tendency to produce long, fiat, flake-like or prismatic fragments of rock which do not remain in place on the road.

The present invention has for its primary object an improved type of roll crusher which is efficient and economical in construction and opperation and which is capable of grinding or crushing rock without the production of elongated, iiake-like or prismatic fragments, and will crush rock to a fine state of subdivision in which the fragments are uniformly cubical or nearcubical in shape.

It is a further object of the present invention to provide a roll crusher of the type stated in which the roll surface can be readily removed and replaced when worn or damaged.

Numerous other objects, advantages and inherent functions of the present invention will become apparent as the same is more fully understood from the following description which, taken with the accompanying drawings, discloses a preferred form of the present invention.

In the drawings (one sheet),

Fig. 1 is a top plan view of a crusher constructed in accordance with and embodying the present invention;

Fig. 2 is a longitudinal sectional view taken along line 2-2 of Fig. 1; and

Fig. 3 is an end elevational View of a pair of complementary crusher rolls constructed in accordance with and embodying the present invention.

Referring now in more detail and by reference characters to the drawings, A designates a crusher comprising a conventional rectilinear frame I having spaced parallel side rails 2 and 3 provided upon their upper faces with aligned pairs of shaft bearings 4, 4', 5, 5', and a lengthwise adjustable pair of shaft bearings 6, Ii', shiftably mounted in pairs of conventional slide ways 'I, 'I'. for tensioning adjustment by means of the adjustment screws 8, 8', and the spiral tension springs 9, 9. Mounted in and extending transversely between the bearings 4, 4', is a main drive shaft I0 provided at itsone extended end with a pulley II which is driven through a belt I2 by a suitable prime mover (not shown). Between the bearing 4' and the pulley II, the shaft I0 isA provided with a sprocket wheel I3 and at its opposite end, outwardly from the bearing 4, is further provided with a pinion I4 having meshing engagement with a main driving gear I5 pinned or otherwise xed upon the extending end of a roll shaft I6, whi-ch is, in turn, rotatably mounted in the bearings 5, 5'. Similarly mounted in and extending between bearings 6, 6', is a second roll shaft Il extending at one end outwardly from the bearing 6' and provided at such extended end with a suitably keyed or pinned sprocket I8, which is connected by means of a roller chain I9 to the sprocket I3. It will, of course, be apparent in this connection that the tooth ratio between the gears I4 and I5 and the sprockets I3 and I8 are identical so that the shafts I6 and I'I will be both driven at identically the same speeds.

Intermediate the bearings 5, 5', and 6, 6', the shafts I6 and I1 are respectively provided with crusher rolls 20, 2I, and wedged or otherwise suitably secured upon the rolls 20, 2l, are companion shaped external shells 22, 23, having axially extending corrugations as at in Fig. 3, and being respectively convex or concave in longitudinal contour as in y in Fig. 2.

As the rock is fed into the crusher A from above, the rolls 20, 2l, are rotated in the direction of the arrows as shown in Fig. 2 and the rock will be crushed and broken as it is pulled between the complementary surfaces of the roll shells 22, 23. By reason of the unique shape of such cuter surfaces, there will be no straight lines of any appreciable length and the space between the shells 22, 23, will itself have a substantially arcuate contour in all directions. As a result, any large pieces of rock which tended to cleave or break in large flake-like fragments or elongated prismatic rod-like shapes will be broken up as they progress into the arcuate space between the rolls inasmuch as this arcuate space will not permit flake-like or prismatic shapes to pass through. In addition to this, the corrugated shape of the shells 22, 23, tends to drag the rock into and through the rolls more rapidly and more efiiciently and accentuate grinding action.

It should be understood that'changes and modications in the form, construction, arrangement,

on, said shells having complmentarilygsliaped outer grinding surfaces, one Qivvhiguirsiizjfjaesd is axially convex and the other of l'whichs'xrfac'e's is axially concave, said surfaces loein'g provided with axially extending intermeshing corrugaaxially convex and the other of which surfaces is axially concave, said surfaces further having intermeshing circumferentially spaced length-wise extending corrugations.

4. In a roll crusher, a, pair of rolls having coop- :grindingV sinjiacesd-4one of" which surlxrlonvislar'i theiirf which g'ave surfaces of the rolls being provided with vaxially extending intermeshing corrugations.

JAIWES L. LATTURE.

A RErnENcEs CITED .,Theifll Wing r'ferences are of record in the 

